Sleep tracking without a wearable
Know your sleep.
Keep it to yourself.
OpenSleep tracks your sleep stages with just your phone, then explains them with an AI sleep coach that runs entirely on your device. No watch, no ring, no account.
Tracking
One tap at bedtime.
Choose how your phone listens to the night, tap Start Sleep, and go to sleep.
On the nightstand
Contactless. OpenSleep uses ambient sound levels to pick up sleep cues. Raw audio is never recorded or stored.
On the mattress
Lay your phone flat next to your pillow and the motion sensor follows your movement through the night.
In the app
Wake up to your whole night.
Sleep stages
Your night, stage by stage.
Awake, REM, light and deep sleep on a stage ring and a full-night sleep pattern chart, with bedtime, wake-up time and total sleep for every session.
History
See the trend, not just the night.
Switch between day, week, month and year views to spot patterns in when and how you sleep.
AI sleep coach
A coach that lives on your phone.
Ask about your sleep, your routine or why you wake up tired. The coach is a Gemma 4 model running on your device with LiteRT-LM: download it once, then chat even with no connection. Your questions and answers are never sent to a server.
Private by design
Your nights stay on your phone.
OpenSleep is built so there is nothing to hand over.
No account
No sign-up and no profile. Open the app and start tracking.
Analysed on your phone
Sleep stages are worked out on your device, not on a server.
Works with your health app
Sessions and stages are saved to Apple Health on iPhone and Health Connect on Android.
Open source
The code is public on GitHub, so anyone can check how it works.
Tonight, just put your phone down.
Download OpenSleep for iPhone or Android.
Sleep tracking is free. The AI sleep coach is a one-time $2.99 purchase that's yours for life, with no subscription.
OpenSleep is a wellness tool, not a medical device. Talk to a doctor about any sleep or health concerns.